Fairfield University DigitalCommons@Fairfield Physics Faculty Publications Physics Department 1-1-2008 Electroexcitation of the Roper resonance for 1.7 I. G. Aznauryan Angela Biselli Fairfield University, [email protected] CLAS Collaboration Follow this and additional works at: https://digitalcommons.fairfield.edu/physics-facultypubs Copyright American Physical Society Publisher final ersionv available at http://prc.aps.org/pdf/ PRC/v78/i4/e045209 Peer Reviewed Repository Citation Aznauryan, I. G.; Biselli, Angela; and CLAS Collaboration, "Electroexcitation of the Roper resonance for 1.7" (2008). Physics Faculty Publications. 58. https://digitalcommons.fairfield.edu/physics-facultypubs/58 Published Citation I. G. Aznauryan et al. [CLAS Collaboration], "Electroexcitation of the Roper resonance for 1.7 This item has been accepted for inclusion in DigitalCommons@Fairfield by an authorized administrator of DigitalCommons@Fairfield. It is brought to you by DigitalCommons@Fairfield with permission from the rights- holder(s) and is protected by copyright and/or related rights. You are free to use this item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses, you need to obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/or on the work itself. For more information, please contact [email protected]. PHYSICAL REVIEW C 78, 045209 (2008) Electroexcitation of the Roper resonance for 1.7 < Q2 < 4.5GeV2 in ep → enπ + I. G. Aznauryan,1,2 V. D. Burkert, 1 W. Kim,4 K. Park,3,4 G. Adams,36 M. J. Amaryan,34 P. Ambrozewicz,18 M. Anghinolfi,24 G. Asryan,2 H. Avakian,1 H. Bagdasaryan,2,34 N. Baillie,43 J. P. Ball,6 N. A. Baltzell,3 S. Barrow,19 V. Batourine,4 M. Battaglieri,24 I. Bedlinskiy,26 M. Bektasoglu,34 M. Bellis,9 N. Benmouna,20 B. L. Berman,20 A. S. Biselli,9,17,36 L. Blaszczyk,19 B. E. Bonner,37 C. Bookwalter,19 S. Bouchigny,25 S. Boiarinov,1,26 R. Bradford,9 D. Branford,15 W. J. Briscoe,20 W. K. Brooks,1,14 S. Bultmann,¨ 34 C. Butuceanu,43 J. R. Calarco,31 S. L. Careccia,34 D. S. Carman,1 L. Casey,10 A. Cazes,3 S. Chen,19 L. Cheng,10 P. L. Cole,1,10,22 P. Collins,6 P. Coltharp,19 D. Cords,1,* P. Corvisiero,24 D. Crabb,42 V. Crede,19 J. P. Cummings,36 D. Dale,22 N. Dashyan,2 R. De Masi,11,25 R. De Vita,24 E. De Sanctis,23 P. V. Degtyarenko,1 H. Denizli,35 L. Dennis,19 A. Deur,1 S. Dhamija,18 K. V. Dharmawardane,34 K. S. Dhuga,20 R. Dickson,9 C. Djalali,3 G. E. Dodge,34 J. Donnelly,21 D. Doughty,1,12 M. Dugger,6 S. Dytman,35 O. P. Dzyubak,3 H. Egiyan,1,31 K. S. Egiyan,2,* L. El Fassi,5 L. Elouadrhiri,1 P. Eugenio,9,19 R. Fatemi,42 G. Fedotov,30 G. Feldman,20 R. J. Feuerbach,9 T. A. Forest,22,34 A. Fradi,25 H. Funsten,43,* M. Y. Gabrielyan,18 M. Garc¸on,11 G. Gavalian,31,34 N. Gevorgyan,2 G. P. Gilfoyle,38 K. L. Giovanetti,27 F. X. Girod,1,11 J. T. Goetz,7 W. Gohn,13 E. Golovatch,24,30 A. Gonenc,18 C. I. O. Gordon,21 R. W. Gothe,3 L. Graham,3 K. A. Griffioen,43 M. Guidal,25 M. Guillo,3 N. Guler,34 L. Guo,1 V. Gyurjyan,1 C. Hadjidakis,25 K. Hafidi,5 K. Hafnaoui,5 H. Hakobyan,2 R. S. Hakobyan,10 C. Hanretty,19 J. Hardie,1,12 N. Hassall,21 D. Heddle,1 F. W. Hersman,31 K. Hicks,33 I. Hleiqawi,33 M. Holtrop,31 C. E. Hyde,34 Y. Ilieva,3,20 D. G. Ireland,21 B. S. Ishkhanov,30 E. L. Isupov,30 M. M. Ito,1 D. Jenkins,41 H. S. Jo,25 J. R. Johnstone,21 K. Joo,13,42 H. G. Juengst,20,34 N. Kalantarians,34 D. Keller,33 J. D. Kellie,21 M. Khandaker,32 K. Y. Kim,35 A. Klein,34 F. J. Klein,10,18 A. V. Klimenko,34 M. Kossov,26 Z. Krahn,9 L. H. Kramer,1,18 V. Kubarovsky,1,36 J. Kuhn,9,36 S. E. Kuhn,34 S. V. Kuleshov,26 V. Kuznetsov,4 J. Lachniet,9,34 J. M. Laget,1,11 J. Langheinrich,3 D. Lawrence,29 T. Lee,31 Ji Li,36 A. C. S. Lima,20 K. Livingston,21 H. Y. Lu,3 K. Lukashin,10 M. MacCormick,25 N. Markov,13 P. Mattione,37 S. McAleer,19 B. McKinnon,21 J. W. C. McNabb,9 B. A. Mecking,1 S. Mehrabyan,35 J. J. Melone,21 M. D. Mestayer,1 C. A. Meyer,9 T. Mibe,33 K. Mikhailov,26 R. Minehart,42 M. Mirazita,23 R. Miskimen,29 V. Mokeev, 1,30 L. Morand,11 B. Moreno,25 K. Moriya,9 S. A. Morrow,11,25 M. Moteabbed,18 J. Mueller,35 E. Munevar,20 G. S. Mutchler,37 P. Nadel-Turonski,20 R. Nasseripour,3,20 S. Niccolai,20,25 G. Niculescu,27,33 I. Niculescu,1,20,27 B. B. Niczyporuk,1 M. R. Niroula,34 R. A. Niyazov,1,34 M. Nozar,1,39 G. V. O’Rielly,20 M. Osipenko,24 A. I. Ostrovidov,19 S. Park,19 E. Pasyuk,6 C. Paterson,21 S. Anefalos Pereira,23 S. A. Philips,20 J. Pierce,42 N. Pivnyuk,26 D. Pocanic,42 O. Pogorelko,26 E. Polli,23 I. Popa,20 S. Pozdniakov,26 B. M. Preedom,3 J. W. Price,8 Y. Prok,1,12,28 D. Protopopescu,21,31 L. M. Qin,34 B. A. Raue,1,18 G. Riccardi,19 G. Ricco,24 M. Ripani,24 B. G. Ritchie,6 G. Rosner,21 P. Rossi,23 D. Rowntree,28 P. D. Rubin,38 F. Sabatie,´ 11,34 M. S. Saini,19 J. Salamanca,22 C. Salgado,32 J. P. Santoro,1,10 V. Sapunenko,1,24 D. Schott,18 R. A. Schumacher,9 V. S. Serov,26 Y. G. Sharabian,1 D. Sharov,30 J. Shaw,29 N. V. Shvedunov,30 A. V. Skabelin,28 E. S. Smith,1 L. C. Smith,42 D. I. Sober,10 D. Sokhan,15 A. Stavinsky,26 S. S. Stepanyan,4 S. Stepanyan,1 B. E. Stokes,19 P. Stoler,36 I. I. Strakovsky,20 S. Strauch,3 R. Suleiman,28 M. Taiuti,24 T. Takeuchi,19 D. J. Tedeschi,3,16 A. Tkabladze,20,33 S. Tkachenko,34 L. Todor,9,38 C. Tur,3 M. Ungaro,13,36 M. F. Vineyard,38,40 A. V. Vlassov,26 D. P. Watts,15,21 L. B. Weinstein,34 D. P. Weygand,1 M. Williams,9 E. Wolin,1 M. H. Wood,3,29 A. Yegneswaran,1 J. Yun,34 M. Yurov,4 L. Zana,31 B. Zhang,28 J. Zhang,34 B. Zhao,13 and Z. W. Zhao3 (CLAS Collaboration) 1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA 2Yerevan Physics Institute, 375036 Yerevan, Armenia 3University of South Carolina, Columbia, South Carolina 29208, USA 4Kyungpook National University, Daegu 702-701, Republic of Korea 5Argonne National Laboratory, Argonne, Illinois 60439, USA 6Arizona State University, Tempe, Arizona 85287-1504, USA 7University of California at Los Angeles, Los Angeles, California 90095-1547, USA 8California State University, Dominguez Hills, Carson, California 90747, USA 9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA 10Catholic University of America, Washington, D.C. 20064, USA 11CEA-Saclay, Service de Physique Nucleaire,´ F-91191 Gif-sur-Yvette, France 12Christopher Newport University, Newport News, Virginia 23606, USA 13University of Connecticut, Storrs, Connecticut 06269, USA 14Universidad Tecnica´ Federico Santa Mar´ıa, Casilla 110-V, Valpara´ıso, Chile 15Edinburgh University, Edinburgh EH9 3JZ, United Kingdom 16Emmy-Noether Foundation, Germany 17Fairfield University, Fairfield, Connecticut 06824, USA 18Florida International University, Miami, Florida 33199, USA 19Florida State University, Tallahassee, Florida 32306, USA 20The George Washington University, Washington, D.C. 20052, USA 21University of Glasgow, Glasgow G12 8QQ, United Kingdom 0556-2813/2008/78(4)/045209(7) 045209-1 ©2008 The American Physical Society I. G. AZNAURYAN et al. PHYSICAL REVIEW C 78, 045209 (2008) 22Idaho State University, Pocatello, Idaho 83209, USA 23INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy 24INFN, Sezione di Genova, I-16146 Genova, Italy 25Institut de Physique Nucleaire ORSAY, Orsay, France 26Institute of Theoretical and Experimental Physics, Moscow, RU-117259, Russia 27James Madison University, Harrisonburg, Virginia 22807, USA 28Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA 29University of Massachusetts, Amherst, Massachusetts 01003, USA 30Moscow State University, General Nuclear Physics Institute, RU-119899 Moscow, Russia 31University of New Hampshire, Durham, New Hampshire 03824-3568, USA 32Norfolk State University, Norfolk, Virginia 23504, USA 33Ohio University, Athens, Ohio 45701, USA 34Old Dominion University, Norfolk, Virginia 23529, USA 35University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA 36Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA 37Rice University, Houston, Texas 77005-1892, USA 38University of Richmond, Richmond, Virginia 23173, USA 39TRIUMF, 4004, Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada 40Union College, Schenectady, New York 12308, USA 41Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA 42University of Virginia, Charlottesville, Virginia 22901, USA 43College of William and Mary, Williamsburg, Virginia 23187-8795, USA (Received 3 April 2008; revised manuscript received 15 August 2008; published 27 October 2008) The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for 1.7 <Q2 < 4.5 GeV2 from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for π + electroproduction on protons at W = 1.15 − 1.69 GeV.